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Figure 6- 38. IEEE 802.1Q Tag
The EtherType and VLAN ID are inserted after the MAC source address, but before the original EtherType/Length or Logical Link Control. Because the packet is
now a bit longer than it was originally, the Cyclic Redundancy Check (CRC) must be recalculated.
Figure 6- 39.Adding an IEEE 802.1Q Tag
56
Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch
Octets
0 123
IEEE 802.1Q Tag
Destination Address (6 Octets)
Cyclic Redundancy Check (4 Octets)
VLAN ID (VID)
Source Address (6 Octets)
Ether Type = 0x8100 Tag Control Information
MAC Length/Type Beginning of Data
CFIUser Priority
3 bits 1 bit 12 bits
4
Adding an IEEE 802.1 Tag
Length/EType
Dest. Src. Data Old CRC
ETypeDest. Src. Data New CRCTa g
Priority VLAN ID
Original Ethernet Packet
New Tagged Packet
- AT-9724TS 1
- Table of Contents 3
- Purpose of This Guide 6
- How This Guide is Organized 6
- Document Conventions 7
- Where to Find Related Guides 8
- Returning Products 9
- FTP Server 9
- Tell Us What You Think 10
- Chapter 1 - Introduction 11
- 1-2 Switch Description 12
- 1-3 Features 12
- 1-4 Ports 13
- Installing the SFP ports 13
- 1-5 Front Panel Components 13
- Chapter 2 - Installation 15
- 2-5 Power On 17
- 2-6 Power Failure 17
- UTP cable 18
- Optical fibre cable 19
- 4-7 Password Protection 23
- 4-8 SNMP Settings 23
- 4-9 IP Address Assignment 24
- 5-1 Introduction 26
- 5-2 Login to Web Manager 26
- 5-3 Web-based User Interface 27
- Areas of the User Interface 27
- Web Pages 28
- 6-1 Switch Information 29
- 6-2 IP Address 30
- Advanced Settings 31
- 6.3 Box Information 32
- 6-4 Port Configuration 33
- 6-5 Port Description 34
- 6-6 Port Mirroring 35
- 6-7 Link Aggregation 35
- 6-8 LACP Port Setting 37
- C Notification 38
- 6-10 IGMP 39
- IGMP Versions 1 and 2 39
- IGMP Snooping 41
- Static Router Ports 42
- 6.11 Spanning Tree 43
- 802.1s MSTP 43
- MST Configuration Table 46
- MSTI Port Information 49
- STP Instance Settings 50
- STP Port Settings 52
- Unicast Forwarding 53
- 8 under the Delete 53
- Static Multicast Forwarding 54
- 802.1Q VLAN Tags 56
- Port-based VLANs 59
- VLAN Segmentation 59
- VLAN and Trunk Groups 59
- Protocol VLANs 59
- Static VLAN Entry 60
- GVRP Setting 63
- 6-15 Traffic Control 64
- 6-16 Port Security 65
- 6-17 Port Lock Entries 66
- 1 2 3 67
- Bandwidth Control 68
- QoS Scheduling Mechanism 69
- Output Scheduling 69
- 802.1p Default Priority 71
- 802.1p User Priority 71
- Traffic Segmentation 72
- 6-19 System Log Server 73
- 6-20 SNTP Settings 75
- Time Zone and DST 76
- 6-21 Access Profile Table 77
- Configur 77
- AT-9724TS Switch 86
- Uncontrolled Port 86
- Configure Authenticator 87
- Local Users 88
- PAE System Control 89
- RADIUS Server 93
- 6-23 Layer 3 IP Networking 94
- Setting Up IP Interfaces 94
- MD5 Key Table Configuration 96
- Route Redistribution Settings 97
- Static/Default Route 98
- Route Preference Settings 99
- Static ARP Table 101
- 8 under the Delete heading 101
- Setting Up RIP 103
- Shortest Path Tree 105
- Areas and Border Routers 106
- Link-State Packets 106
- Hello Packet 109
- Link-State Request Packet 111
- Link-State Update Packet 112
- Router Links Advertisements 114
- Summary Link Advertisements 116
- General OSPF Settings 118
- OSPF Area ID Setting 118
- OSPF Interface Settings 119
- 8 in the Delete 121
- OSPF Host Route Settings 122
- DHCP / BOOTP Relay 123
- DHCP/BootP Relay Settings 124
- DNS Relay 124
- DNS Relay Static Settings 125
- VRRP Configuration 126
- VRRP Interface Settings 127
- 8 to delete this VRRP entry 127
- IP Multicast Routing Protocol 130
- IGMP Interface Configuration 130
- DVMRP Interface Configuration 131
- DVMRP Global Setting 131
- DVMRP Interface Settings 131
- PIM-DM Configuration 132
- 7-1 Security IP 134
- 7-2 User Accounts 134
- Admin and User Privileges 135
- Authentication Server Hosts 139
- Login Method Lists 140
- Local Enable Password 142
- Enable Admin 143
- 7-4 Secure Socket Layer (SSL) 144
- Download Certificate 144
- Configuration 145
- 7-5 Secure Shell (SSH) 146
- SSH Configuration 146
- SSH Algorithm 146
- SSH User Authentication 148
- Chapter 8 - SNMP Manager 150
- SNMP View Table 152
- 8 in the Delete column cor 152
- SNMP Group Table 153
- SNMP Host Table 155
- SNMP Engine ID 156
- Chapter 9 - Monitoring 157
- 9-3 Packets 158
- Received (RX) 158
- UMB Cast (RX) 160
- 9-4 Errors 163
- 9-5 Size 166
- Stacking Information 167
- Device Status 168
- 9-6 MAC Address 169
- 9-7 Switch History Log 170
- 9-8 IGMP Snooping Gr 171
- 9-9 IGMP Snooping Forwarding 171
- 9-10 Browse Router Port 172
- 9-11 Port Access Control 172
- Authenticator State 172
- Authenticator Diagnostics 176
- RADIUS Authentication 177
- RADIUS Accounting 178
- 9-12 Lay 179
- Browse IP Address 179
- Browse Routing Table 180
- Browse ARP Table 180
- Browse IGMP Group Table 181
- OSPF Monitoring 181
- Browse OSPF Neighbor Table 182
- DVMRP Monitoring 183
- Browse DVMRP Routing Table 183
- PIM Monitoring 184
- PIM Neighbor Address Table 184
- 10-1 TFTP Service 185
- Download Firmware 185
- Config Firmware Image 187
- 10-4 Ping Test 188
- 10-5 Save Changes 189
- 10-6 Reset 189
- 10-7 Reboot Device 190
- 10-8 Logout 190
- Physical & Envir 191
- Performance 192
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